uninstall - Why does removing apps frees less memory compared to installing?

suppose had installed ndiswrapper, shows

   need 226 kb of archives.    after operation, 1,110 kb of additional disk space used.

but when remove purge command, says

  after operation, 76.8 kb disk space freed.

i new linux , learned lot pls can explain?

when install software install , dependencies needs, these other software , libraries needs run, when remove it, remove software installed.

you can remove dependencies (assuming they're not required else) with:

sudo apt-get autoremove

or in 1 step removal of original package:

sudo apt-get autoremove ndiswrapper

Primitatvve